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## Homework Statement

A mass weighs 20 N at the surface of a planet of 3000 km radius. What is the mass's weight when it is in orbit 3000 km above the surface of the planet?

## Homework Equations

F = (Gm

_{1}m

_{2})/r

^{2}(well... not really)

U

_{g}= mgy

## The Attempt at a Solution

I don't even know. I'm trying to find the g on this planet but I'm not sure where that would lead me... Help please >_<